Aretha Franklin is undergoing treatment for an undisclosed health issue, forcing her to cancel two appearances in Chicago and Connecticut later this month, the Associated Press reports.

This isn’t the first time Franklin has refused to divulge health problems: In 2010, she was hospitalized amidst rumors she had incurable pancreatic cancer, and although she later denied cancer, she never revealed why she needed treatment.

Her rapid weight loss in 2011 suggested gastric surgery, which Franklin and not confirmed or denied. That year, she told Wendy Williams: "Okay, well a lot of things were said. I left that behind; I’m feeling wonderful, I’m feeling great and I couldn’t be feeling any better than I’m feeling right now."